Issue 5, 2005

Photodissociation and photoionization of pyrrole following the multiphoton excitation at 243 and 364.7 nm

Abstract

Photoelectron imaging and time of flight mass spectrometry are used to study the multiphoton ionization and dissociation of pyrrole and its cation following excitation at 243 nm and at 364.7 nm. Our results confirm the 8.2 eV ionization potential of pyrrole and the 9.2 eV ionization threshold for forming the 2B1 first excited state of the cation. Prompt photolysis of the N–H bond in neutral pyrrole following one-photon excitation to its 11A2 neutral excited state is inferred from analysis of the two-photon photoelectron spectrum recorded at 243 nm, confirming the findings of recent translational spectroscopy studies. Facile dissociation of the pyrrole cation is also observed following excitation at 243 nm; analysis of the fragment cations indicates the operation of a complex dissociation mechanism involving dual bond fission and possible migration of the H atom originally bonded to the nitrogen heteroatom.

Graphical abstract: Photodissociation and photoionization of pyrrole following the multiphoton excitation at 243 and 364.7 nm

Article information

Article type
Paper
Submitted
12 Oct 2004
Accepted
23 Dec 2004
First published
18 Jan 2005

Phys. Chem. Chem. Phys., 2005,7, 892-899

Photodissociation and photoionization of pyrrole following the multiphoton excitation at 243 and 364.7 nm

Alrik. J. van den Brom, M. Kapelios, T. N. Kitsopoulos, N. H. Nahler, B. Cronin and M. N. R. Ashfold, Phys. Chem. Chem. Phys., 2005, 7, 892 DOI: 10.1039/B415766D

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